No airport card installed!  I'm not using the internet and now what should I do?

no airport card installed!
I'm not using the internet and now what should I do?

 menu/About this Mac/System Information (at the bottom, may be called something else) - run that and see if the Airport card is detected.
Some things you can try.
https://discussions.apple.com/message/22246571#22246571
If you live near an Apple Store, make a Genius Bar appointment to have the computer tested. Supposedly there is no charge for testing.
Genius Bar Reservation US

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